Journal of the Korean Magnetics Society (한국자기학회지)

The Korean Magnetics Society (한국자기학회)
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Structural, Optical, and Magnetic Properties of Si1-xMnxTe1.5 Single Crystals

Si1-xMnxTe1.5 단결정의 구조적, 광학적, 자기적 특성에 관한 연구

  • Published : 2006.06.01
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Abstract

We have investigated the Mn concentration-dependent structural, optical, magnetic properties in IV-VI diluted magnetic semiconductor $Si_{1-x}Mn_xTe_{1.5} $ crystals prepared by the vertical Bridgman technique. X-ray studies showed the single crystalline hexagonal crystal structure. From the optical absorption measurements energy band gap were found to decreases with increasing x and temperature. From the magnetization measurements the samples had ferromagnetic ordering with Curie temperature $T_C$ about 80 K. With increasing Mn concentration, the average magnetic moments per Mn atom determined from the saturated magnetization increased.

본 연구에선는 수직 Bridgman 법으로 묽은 자성 반도체 $Si_{1-x}Mn_xTe_{1.5} $ 단결정을 성장시켜 Mn의 조성비 변화에 따른 광학적, 전지적, 그리고 자기적 특성을 조사하였다. X-선 회절 실험으로부터 육방정계(hexagonal) 구조임을 확인하였다. 광흡수 측정으로부터 에너지 띠 간격은 조성비 x와 온도 증가에 대하여 감소함을 보였다. 성장시킨 시료의 경우 강자성 특성을 나타내었으며, Curie 온도는 80K 이상이었다. Mn의 조성비가 증가함에 따라 평균 자기 모멘트와 보자력 값은 증가하였다.

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References

  1. R. Fiederling, M. Keim, G. Reuscher, W. Ossau, G. Schmidt, A. Waag, and L. W. Molenkamp, Nature (London), 402, 787 (1999) https://doi.org/10.1038/45502
  2. Y. Ohno, D. K. Young, B. Beschoten, F. Matsukura, H. Ohno, and D. D. Awschalom, Nature (London), 402, 790 (1999) https://doi.org/10.1038/45509
  3. S. Koshihara, A. Oiwa, M. Hirasawa, S. Katsumoto, Y. Iye, C. Urano, H. Takagi, and H. Munekata, Phys.Rev. Lett., 78, 4617 (1997) https://doi.org/10.1103/PhysRevLett.78.4617
  4. M. Katsuda, K. Hosoe, M. Nakaseko, and Sumitomo, Electric Technical Review 30, 84-7 (1990)
  5. H. J. Schmitt, H. Dammann, and J. Instn, Electronics & Telecom. Engrs., 34, 286 (1988)
  6. D. L. Dreifus, R. M. Kolbas, R. L. Harper, J. R. Tassitino, S. Hwang, and J. F. Schetzina, Appl. Phys. Lett., 53, 1279 (1988) https://doi.org/10.1063/1.99997
  7. R. N. Bicknell, N. C. Giles-Taylor, J. F. Schetzina, N. G. Anderson, and W. D. Laidig, J. Vac. Sci. Technol., A4, 2126 (1986)
  8. T. Stroy, R. R. Galazka, R. B. Frankel, and P. A. Wolff, Phys. Rev. Lett., 56, 777 (1986) https://doi.org/10.1103/PhysRevLett.56.777
  9. Y. Fukuma, H. Asada, M. Arifuku, and T. Koyanagi, Appl. Phys. Lett., 80, 1013 (2002) https://doi.org/10.1063/1.1445477
  10. R. Rimet, C. Schlenker, and Vincent, Journal of Magnetism and Magnetic Materials, 25, 7 (1981) https://doi.org/10.1016/0304-8853(81)90141-4
  11. Y. H. Hwang, H. K. Kim, S. Cho, Y. H. Um, and H. Y. Park, J. Crystal Growth, 249, 391 (2003) https://doi.org/10.1016/S0022-0248(02)02099-7
  12. J. F. Moulder, W. F. Stickle, P. E. Sobol, and K. D. Bomben, Handbook of X-Ray Photoelectron and Spectroscopy (Perkin- Elmer, Eden Prairie, MN, 1992)
  13. Y. Fukuma, H. Asada, J. Miyashita, N. Nishimura, and T. Koyanagi, J. Appl. Phys., 93, 7667 (2003) https://doi.org/10.1063/1.1556113
  14. H. Ohno, Science, 281, 951 (1998) https://doi.org/10.1126/science.281.5379.951
  15. K. Ueda, H. Tabata, and T. Kawai, Appl. Phys. Lett., 79, 988 (2001) https://doi.org/10.1063/1.1384478
  16. Y. Matsumoto, M. Murakami, T. Shono, T. Hasegawa, T. Fukumura, M. Kawasaki, P. Ahmet, T. Chikyow, S. Koshihara, and H. Koinuma, Science, 291, 854 (2001) https://doi.org/10.1126/science.1056186